Sheet metal bobbin



FIG. 1 is an isometric view of a sheet metal bobbin embodying the design of this invention.

FIG. 2 is a front view of the sheet metal bobbin illustrated in FIG. 1.

FIG. 3 is a right side elevation of the sheet metal bobbin illustrated in FIGS. 1 and 2; and,

FIG. 4 is a left side elevation of the sheet metal bobbin illustrated in FIGS. 1, 2 and 3.

The appearance of the sheet metal bobbin from the bottom, top and rear is identical to that illustrated in FIG. 2. 

The ornamental design for a sheet metal bobbin, as shown and described. 